Ipomoea miquihuanensis

Wood, John R. I., Munoz-Rodriguez, Pablo, Williams, Bethany R. M. & Scotland, Robert W., 2020, A foundation monograph of Ipomoea (Convolvulaceae) in the New World, PhytoKeys 143, pp. 1-823 : 1

283. Ipomoea miquihuanensis J.A. McDonald, Brittonia 39: 110. 1987. (McDonald 1987b: 110)

Type.

MEXICO. Tamaulipas, 7 km SW of Miquihuana, Stanford, Retherford & Northcraft 705 (holotype GH00054520, isotype MO).

Description.

Slender twining herb, stems glabrous, reddish. Leaves petiolate, ovate-deltoid, base cordate to sagittate with narrow acute to obtuse auricles, apex finely acuminate and mucronate, both surfaces glabrous; petioles 0.5-3 cm. Inflorescence of solitary axillary flowers; peduncles 1.2-3 cm; bracteoles minute, aristate; pedicels 3-11 mm; sepals unequal, ovate-oblong, obtuse to rounded, sometimes mucronulate, glabrous, dotted with dark glands, margins narrow, scarious, outer 3-4 × 2 mm, inner 4.5-6 × 3 mm; corolla 4-6 cm long, funnel-shaped, reddish-purple with paler tube, glabrous, limb c. 4 cm diam., subentire. Capsules and seeds unknown.

Illustration.

McDonald (1987c: 85).

Distribution.

Apparently rare in pine forest at 2000-3200 m in NE Mexico.

MEXICO. Tamaulipas: type of Ipomoea miquihuanensis . San Luis de Potosí: M. Virlet d’Aoust 1852 (P). Nuevo León: J.C. Hinton 19261 (GBH, n.v.).

Note.

The dark glands on the sepals and the high altitude habitat confirm the affinity with Ipomoea dumetorum , but it is easily distinguished by its much larger corolla.